Azo-dyestuffs and process of making same



Patented Sept. 8, 1936 PATENT OFFICE AZO-DYESTUFFS AND PROCESS OF MAKING SAME Friedrich Felix and Wilhelm Huber, Basel, Switzerland, assignors to the firm of Society of Chemical Industry in Basle, Basel, Switzerland No Drawing. Original application March 21, 1935, Serial No. 12,299. Divided and this application October 15, 1935, Serial No. 45,163. In Switzerland March 24, 1934 9 Claims.

This being a division of our application for patent Ser. No. 12,299, filed in the U. S. A. on March 21, 1935, and in Switzerland on March 24, 1934, of which the following is a full, clear and exact specification.

This invention relates to the manufacture of dyestuffs by coupling a diazotized aromatic amine of the general formula in which Y stands for a sulfone radical of the general formula SO2CH2-R wherein R represents H, alkyl or phenyl, and X stands for a nitrogenous group which is linked with its nitrogen atom tothe organic radical, such as a N02- group, an

alkyl N/ group alkyl R(|J-lII-group (R representing hydrogen, alkyl, aralkyl or aryl) e. g. an acidylamino-group, such as an acetylaminoor benzoylamino-group, with a coupling component of the general formula ./R1 AN in which A stands for an unsulfonated nucleus of the naphthalene series which may or may not be substituted, and R1 and R2 each stand for hydrogen, alkyl, aryl or aralkyl radicals, the con ditions of coupling being chosen in such a manner that the group is the group which causes coupling.

The term alkyl radicals comprises not only the radicals of hydrocarbons, such as methyl,

ethyl, propyl 0r butyl radicals, and the like, butalso, as used in the scientific literature, of. Anthracene and Anthraquinone by E. de Barry Barnett, London 1921, page 207, and in the Patent literature cf. British Patent 26,336/ 1910, claim 1, substituted alkyl radicals, for example, alkyl radicals substituted by halogen, such as, for example, chlcro-, bromoor iodo-ethyl radicals, alkyl radicals substituted by OH-groups, such as hydroxyethyl-, hydroxypropyl-, hydroxybutylor dihydroxy-propylene radicals, further the ethers and esters thereof, such as methoxyethylor acetoxyethylor ethylsulfuric acid radicals, further also alkylcarboxylic acid radicals and their derivatives, such as propionic acid radicals or propionic ester'radicals or propionic acid amide radicals, or the radicals of ethylnitrile or ethylsulfocyanide. The arylor aralkylradicals R1 and R2 may also be substituted in the aromatic nucleus.

As products of the general formula phenyl-Z-ethylsulfone, the 1-amino-4-benzylaminophenol-2-benzylsulfone, the l-amino-4-phenoxy-acetylaminophenyl-Z-methylsulfone, the 1- amino-4-(4'-ethoxy) -phenoxyacetylam.inophenyl-Z-methylsulfone, 1-amino-4-(2'-methyl) -phenoxyacetyl-aminophenyl-2-ethylsulfone, the 1- amino-4-phenyl-acetylaminophenyl 2 methylsulfone, the l-amino-4-dimethylarninophenyl-2- ethylsulfone, the 1-amino-4-diethylaminophenyl- Z-ethylsulfone, and the like.

As coupling components of the general formula also explained above, there are suitable any unsulfonated bases of the naphthalene series capable of coupling, such as ocand p-naphthylamine, 1-amino-2-methoxynaphtha1ene or 1-amino-2- ethoxy-naphthalene such as N-methyl-a-naphthylamine, N-ethyl-a-naphthylamine, N-rnethyl-[i-naphthylamine, N-ethyl-pnaphthylamine, the so-called w-methane-sulfonic acids of ocand [i-naphthylamine, l-N-methoxyethylamino-naphthalene of the formula contains no phenolic OH-group in the aromatic nucleus A of the naphthalene series, the expression coupling conditions in which the amino group causes coupling means the coupling of the component in neutral or acid medium usual for aromatic amines. However, if the aromatic nucleus A contains one or more phenolic OI-I-groups, coupling should be carried out in an acid medium. But, as is well known, the selection of the coupling conditions in such a manner that the amino group of a coupling component is the group which causes coupling does not present a problem to the expert, but a known measure.

The dyestuffs thus produced can be converted into other valuable products by treating them with suitable reducing agents so that the nitrogroup of the diazo-component is reduced, and if desired, either acylating or alkylating the new amino-group by means of the usual agents, or converting the reduced body into other dyestuffs by diazotizing the amino-group and coupling with suitable coupling components.

The new dyestuffs correspond therefore to the general formula in which X stands for a nitrogenous group which is linked with its nitrogen atom to the aromatic nucleus, such as an NOz-group, an NHz-group, an

alkyl N group alkyl (R1 representing hydrogen, alkyl, aralkyl or aryl) i. e. an acetylamino or benzoylamino-group, a phenylacetylaminoor phenoxyacetylaminogroup, Y stands for a sulfone radical of the general formula SO2-CH2-R (R representing H, alkyl or aryl), A for an unsulfonated aromatic nucleus of the naphthalene series, and B for an amino-group wherein R stands for H, alkyl or aralkyl, which amino-group stands in 2 or 4-position to the --I\l=N-gr0up.

The dyestuffs thus obtained are red to green powders, which are excellently suitable for dyeing textiles such as artificial silk or esters and ethers of cellulose, for example acetylcellulose and other conversion products of cellulose, such as nitro-cellulose, etc. The dyestuifs are also suitable for dyeing lacquers, varnishes and plastic masses, particularly nitrocellulose and phenolformaldehyde lacquers. They dye these products the same tints as the textiles. They can be used as intermediate products for the manufacture of further dyestuffs.

The above mentioned azo-dyestuffs are dark powders insoluble in water, but dissolving in acetic ester to red violet to blue and green solutions, and dyeing acetate artificial silk from suspension dye-baths red, violet to blue and green tints.

These non-sulfonated dyestuffs, which are sparingly soluble in water, are used for dyeing acetate artificial silk, preferably in finely dispersed form produced by grinding them with dispersing agents, for instance the sulfonated residues from the manufacture of benzaldehyde or turpentine oil and the like, in the presence of water until a fine paste is produced; or they may be converted in the presence of further quantities of the aforesaid or other auxiliary substances, such as sulfite cellulose waste liquor, by cautiously drying them in a vacuum at a temperature which is nottoo high, intodry preparations capable of being powdered. V

The following examples illustrate the invention, the parts being by weight:

Example 1 A mineral acid diazo-solution, made from 21.6 parts of 2 amino-S-nitro-phenylmethylsulfone is coupled with a solution of 19.5 parts of 5-hydroxy-1-aminonaphthalene hydrochloride in water. The mixture is stirred until the coupling is complete. The dyestufi thus obtained is filtered and washed until neutral. When dry it is a dark powder soluble in acetone, ethyl acetate or the like to a greenish-blue solution. In suitable dispersion it dyes acetate artificial silk greenishblue tints which can be discharged white. The dyestuff corresponds with the formula The dyestuif from the 2-amino-8-hydroxye naphthalene dyes acetate artificial silk or nitrocellulose varnishes violet tints; blue tints are obtained from the 1,5- or 1,8-diaminonaphthalene, further from the 1-amino-S-acetylaminonaphthalene.

In the following table there are listed some other dyestufis obtainable in accordance with this invention:-

The formulae of characteristic products of the table are the following:-

What we claim is:

1. Process for the manufacture of azo-dyestuffs, consisting in coupling a diazotized amine of the general formula in which Y stands for a sulfone radical of the formula SOz-CHz--R, R standing for a member of the group consisting of hydrogen, alkyl and aryl, and X stands for a nitrogenous group selected from the group consisting of the nitro group, acyl-amino groups and dialkyl-amino groups and which is linked with its nitrogen atom to the aromatic nucleus, with mono-amines capable of coupling corresponding to the general formula A-B in which A stands for an unsulfonated aromatic nucleus of the naphthalene series, and B stands for such an amino group which enables the radical A to combine with diazo-compounds to form azo-compounds, the coupling being carried out in an acid medium.

2. Process for the manufacture of azo-dyestuffs, consisting in coupling a diazotized amine of the general formula IIIH:

in which Y stands for a sulfone radical of the formula SOzCH2--R, R standing for a member of the group consisting of hydrogen, alkyl and aryl, and X stands for a nitrogenous group se-' lected from the group consisting of the nitro p, groups and which is linked with its nitrogen atom to the aromatic nucleus, with unsulfonated monoamino-monohydroxynaphthalenes, the coupling being carried out in an acid medium. 1

3. Process for the manufacture of azo-dyestufis, consisting in coupling a diazotized amine of the general formula ITTH:

with unsulfonated amino-naphthols of the general formula in which one Y stands for an NHz-group and the other Y for a hydrogen atom, the coupling being carried out in an acid medium.

4. Process for the manufacture of azo-dyestufis, consisting in coupling a diazotized amine of the general formula S O g-alkYl in which the alkyl radical contains at most 2 carbon atoms, with the unsulfonated 1-amino-5- hydroxynaphthalene, the coupling being carried out in an acid medium.

5. Process for the manufacture of an a-zo-dyeacyl-amino groups and dialkyl-amino stuff, consisting in coupling thediazotized aminocompound of the'formula I or with the unsulfonated 1-amino-5-hydroxynaphthalene, the coupling being carried out in an acid medium.

6. The azo-dyestufis of the general formula in which X stands for a nitrogenous group selected from the group consisting of the nitro group, acyl-amino groups and dialkyl-amino groups and which is linked with its nitrogen atom to the aromatic nucleus, Y for a sulfone radical of the general formula SO2CH2R, R Standing for a member of the group consisting of hydrogen, alkyl and aryl, in which formula further the aromatic radical of the naphthalene series is not sulfonated and does not contain more than one phenolic OH-group, one Z stands for hydrogen and the other Z for an amino-group, the naphthalene nucleus carrying no other substituent than the amino-group Z and the phenolic OH- group, which products are dark powders soluble in pyridine to red, violet, blue and green solutions and dyeing lacquers and the fiber red to blue and green tints.

7. The unsulfonated azo-dyestufis of the general formula Y G Y SOzCH| HO F AM which product is a dark powder insoluble in water, but soluble in acetic ester to a blue solution and dyeing acetate'artificial silk from a bath containing this dyestuff'in fine suspension intensive pure blue tints.

9. The unsulfonated azo-dyestufi of the formula which product is a dark powder insoluble in water, but soluble in acetic ester to a violet solution and dyeing lacquers violet-blue tints.

FRIEDRICH FELIX. WILHELM HUBER. 

